<template>
  <div class="upload-container">
    <el-button :style="{background:color,borderColor:color}" icon="el-icon-upload" size="mini" type="primary" @click=" dialogVisible=true">
      upload
    </el-button>
    <el-dialog :visible.sync="dialogVisible">
      <el-upload
        :multiple="true"
        :file-list="fileList"
        :show-file-list="true"
        :on-remove="handleRemove"
        :on-success="handleSuccess"
        :before-upload="beforeUpload"
        class="editor-slide-upload"
        action="https://httpbin.org/post"
        list-type="picture-card"
      >
        <el-button size="small" type="primary">
          Click upload
        </el-button>
      </el-upload>
      <el-button @click="dialogVisible = false">
        Cancel
      </el-button>
      <el-button type="primary" @click="handleSubmit">
        Confirm
      </el-button>
    </el-dialog>
  </div>
</template>

<script>
// import { getToken } from 'api/qiniu'

export default {
    name: 'EditorSlideUpload',
    props: {
        color: {
            type: String,
            default: '#1890ff'
        }
    },
    data() {
        return {
            dialogVisible: false,
            listObj: {},
            fileList: []
        }
    },
    methods: {
        checkAllSuccess() {
            return Object.keys(this.listObj).every(item => this.listObj[item].hasSuccess)
        },
        handleSubmit() {
            const arr = Object.keys(this.listObj).map(v => this.listObj[v])
            if (!this.checkAllSuccess()) {
                this.$message('Please wait for all images to be uploaded successfully. If there is a network problem, please refresh the page and upload again!')
                return
            }
            this.$emit('successCBK', arr)
            this.listObj = {}
            this.fileList = []
            this.dialogVisible = false
        },
        handleSuccess(response, file) {
            const uid = file.uid
            const objKeyArr = Object.keys(this.listObj)
            for (let i = 0, len = objKeyArr.length; i < len; i++) {
                if (this.listObj[objKeyArr[i]].uid === uid) {
                    this.listObj[objKeyArr[i]].url = response.files.file
                    this.listObj[objKeyArr[i]].hasSuccess = true
                    return
                }
            }
        },
        handleRemove(file) {
            const uid = file.uid
            const objKeyArr = Object.keys(this.listObj)
            for (let i = 0, len = objKeyArr.length; i < len; i++) {
                if (this.listObj[objKeyArr[i]].uid === uid) {
                    delete this.listObj[objKeyArr[i]]
                    return
                }
            }
        },
        beforeUpload(file) {
            const _self = this
            const _URL = window.URL || window.webkitURL
            const fileName = file.uid
            this.listObj[fileName] = {}
            return new Promise((resolve, reject) => {
                const img = new Image()
                img.src = _URL.createObjectURL(file)
                img.onload = function() {
                    _self.listObj[fileName] = { hasSuccess: false, uid: file.uid, width: this.width, height: this.height }
                }
                resolve(true)
            })
        }
    }
}
</script>

<style lang="scss" scoped>
.editor-slide-upload {
  margin-bottom: 20px;
  /deep/ .el-upload--picture-card {
    width: 100%;
  }
}
</style>
